据说，警察最近一直在调查这个重要案件。的翻译：It is said that police recently have been investigating this important case. 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

It is said that the police have been investigating the recent important cases.

It is said that police recently have been investigating this important case.

It is said, the police recently continuously were investigating this important case.

It is said that the police has recently been investigating this important cases.

It is said that police recently have been investigating this important case.